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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f72675a8ef75b46e78c7f8600a6d16d71ca821e563272eeae888c8f586b0469' 
  AND token = '7c4Gbnv8RQBRAFlKC5RNWqRuzluqzv0SbUwE+93D7Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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