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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e230e5f9ab9a6d7a1baec63fd385deddba59e5104aee831a59986c9e8d9c2878' 
  AND token = 'wD7WbiTZfcJKTAeYO0WnR0VP7daiY1FU0A0AsxBlnMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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