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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d15e41b7af84ad5b14be3cc25809dad7d6ade98f9234ae1fd92699779ef28e' 
  AND token = 'zhaCmz3uocxsdBZUbwPknzJ0ZHBo5tR0UPdLIM2dgug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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