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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d77a84978ce46704fac1ef61df09b71cf8206f52044203f65c453dbb21df969' 
  AND token = '9SfJtihrpYiZCjbjkeDwOeVT4HWTVKJi5GxQM6yNVKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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