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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b927b9d6a384c876de1e87c4a9f5b9b22bebfa9c419aefd4556f89522e008d' 
  AND token = 'iZ23K0UJh5dfiP2us/20typKxXq7bhIr3DA37zPdG7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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