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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2288424292644fcc7303c482679c6e6b72c60764cc863ea17cd9adcebde7c8f7' 
  AND token = '+3EgPsdCIEDtABlfvl7pboSYNjo2pZN0xWfEdOWs6Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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