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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1bf4771c0b2864a88ec44edecf91b02089072515dfff75a6938716259d9982' 
  AND token = 'XVf5onAAt43Y2hoQHmrsziBuxSX8X6kRnrKsVhmIiq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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