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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981211d19373683e82edd21ee230878c23da419df820970f13c014e801db4447' 
  AND token = 'wUdLElhkA+jzm7/1tUVigh9S7EtZkGy6M3cH8lCUUr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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