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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0e1534f27d949799a1faa7ab9fe573b8e471206e78a5570494ff9f8b328188' 
  AND token = 'dox2dlEGTHYiVjF0qLH6of+hi7fVQ4sdywYtSd0eukI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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