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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69dbe545705b52a29231e808994722a1d4d0fc508290cb6cabc6f254f776be4' 
  AND token = 'dgOGxzDfb7pmDu8oM83Whos7PP0l+lxma6uIY7RHwtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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