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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9166db8d7b15bf06ed2d72d2c0176f7a161499f2a17bb425ad0d77f55b12be55' 
  AND token = 'LBwKj/Oj6xt7yicUBKGDzNKlSYea1caCz87V9uW/jEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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