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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a017c5b89ca823d07755f3eaca995b671a5a8ffae01f6d60ef85a8144d22d2' 
  AND token = 'G4m91tFcpiz8bq8PGmWWJYG00YNG5VhIXZ5WdD58RS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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