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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b59ff6afc250ef7a2236f0f9bcc2db479a665f0623aa3e8d281731c6243831e' 
  AND token = 'T1jm8JQxwrX9Jt/zVO+eZ+By1t5gDJNJm3rPuJ2todE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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