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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5375adbacc2aa9201b8975382149860042fb3fa22229dea6424ef056d821d48' 
  AND token = '2wkW4cLItH3yBW5IF5rUK6nXvJCes5QFU9PAy7dYuVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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