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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0743f0b700dac4884ecd20e8fea414d2ecf5b41e5bc6f83003a98e3775a20a' 
  AND token = 'VbiavIwqGnOPR6CrthbB6OxaVceH6Ykg7Y/fUALS6qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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