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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96591bdd4191e3ef727109d24f6abc3dc7bb22b6e87e067a12710450e1718655' 
  AND token = 'JcncM5JUiQlsJE7rJmE7DQMoQQg04FjCjWII6X//pwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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