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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0faf260ee2ba26370f8462ce7b84379db168626e9c306c0dae9c7f9ebfecab' 
  AND token = 'HL0WuDtZfc9v4oMQyI/kjlVra6/SP9Z7Mwedd340/14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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