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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b67cab30ca64c8de4482bfd7c212f524eb76b4034c1bdaff156b4dba0c68b4' 
  AND token = '3l4Mxkn3d9OfXoqfn0o/oPIzEofuNj1ZFfr6A+mMlWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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