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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4517a6709e0ff34fd1935c7c76ae870fd92cc1296f713f68d6bdece14958eb' 
  AND token = 'GEUkZ+U3GmwPJxHw0EXUVCefCRb818zizAWepl9X8k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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