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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a747a2ec69cafe5f9535d7ca065a233a313f5264d1dcf70da279a6a444001e1' 
  AND token = 'VQTcTBZW0m1TUsdWxPRtaCbBEaLaVyR0x5hja6YZ1Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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