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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c13914cca1082559832de852a1d1eb118a41a6bf1c28955f7ff447fd54add98' 
  AND token = 'DDg3xZRafUezgy8NUn3cZ/kSiM1GDE3buKGYntva61E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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