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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e85f4b01c3ef6b5a8f179d855fb51ee50742a76d580417f430afe6c99fe3b2b' 
  AND token = '6kioqa8lNoMqQKlwWkUD44444kzg8dYQvPzhMAavBFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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