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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890fb07630f04818f89eb428ca420763d6995246624d01d7231b16549e643afc' 
  AND token = 'dfRxanbuUFUKgqVc9cN3jJQsT2LYqnaMim+FLtf+QPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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