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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9096b8dc7ad82e95dae0801b2794aa4834ce978af2be6f1e0a7b6b34580579' 
  AND token = 'vnHMgiuhYIwHNfcEss/peJb4Wyak4o69Y/m78C0Au4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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