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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7dfd04b3be2bd384342a3a733bc6d621eceb8b8aa6aaa6386ac4efc78c4d3e8' 
  AND token = 'n7TIdH8beXiIDmmXfBAKaXuEIZ1KOl1Au4FkdL5JkNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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