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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8e9f4f320ff49c9af85a70c775d835ee48dc9082a84555b7dbdd7db545dac2' 
  AND token = 'AEOeid4TiU5FkFltlsRLgfzBGkY3RG3vJZSAKCsancM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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