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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '271ac44cc0ecb9c2a7e2ed26949182f739471ff5f5f96aeba5ff21eaaa705b72' 
  AND token = 'p+bH5k77fKKII4AeH0XeB0XCHF0HOdBkKANZ6A5SI4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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