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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1448c2048441f56e53dbf7e34ba78550438c08c90acf96c0532c8747080c04d' 
  AND token = 'oyDv4C/k4NKMZis5kOHTVc1bRpBupGfJY04NL5eM00c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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