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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc205353e70a96ee5cb140789a07ab2ecbe626de0edbbfe1551a65d0db915c8' 
  AND token = '7xtfmOF8j38LYwPNr8HB3rnzklYl1zu3qXhr9JUU/Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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