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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1a97ae342621d9e232e94095acaffc0f2d57e07d4595cd23c2e6452409aa39' 
  AND token = 'WYkqlc+yHqQ6N3qk8ihnbIhyE2vTcWDe2/wc3sdi/zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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