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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab53dc6aae0505dcf8856771f852006f989283c9eb53e898516e23e054d6f1f9' 
  AND token = 'cl81jJ9yeJJt6ZUk2be64GLEGnZaOY47wZ+kEiMsQTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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