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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '434e9702bdceb2ec8d34d03b58c55a5abb55c7a2f45dd536734914fcac99c376' 
  AND token = '/OwwKvS3Hc65rV1Dt9/wPMsQWaK103UNS49x9vppI6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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