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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353b9bd8eb7be69d1a013be6fae71a61602f04d4e72edc735038f2f397bad3f3' 
  AND token = 'k8dSN7Rx2okuT3oNbki5SDAUFil4LHNjYNzBCdZBH1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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