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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37feccd261d55cf6f942d2edcad8f8f62c67f62da0a1494e5dac9f9c289751fe' 
  AND token = 'tU29deh85xdNBONv2/KPiU6nxxFEzDM7caQoXdM6nXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}