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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e7f3923c49830801444705fbeddd86f656d0a9162d679e23a606556a654c47' 
  AND token = 'zrU0soIzBYk3q6VX6nWK2Blf7EEocVInkS4hGd4/iZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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