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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5808d40c3ed550708b808c3bc26367d62180c4cac1e839b558e597e94a229fa' 
  AND token = '6Z3M8o2dvMXSF02ly/EO64tuuVvM4g9ySEssDqhe928=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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