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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc4ed6f24fd6b11811abd17daee39ceade787ca30399731f212969a7c0ab98d' 
  AND token = 'bcxC5di5AhKxkwiPI6EjwZdlwZSUgDzBw/qEBIPf8Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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