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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27bfb3efd03e7c0b4668ddfeee00a0204474e3ce0c4cd8c1e0a2801ea47bf171' 
  AND token = 'ly/PN75zFvBa7jmPD5CkLZ3VErpZZU1mWClP4E88qBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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