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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbcc98dd98a63a0b2724e396da86e9e63eb03a14209a0b781b56f349fe38dad3' 
  AND token = 'AwqoHilk3nItLk9Sf8WddxOmofulPbm6NluhZDMkhUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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