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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f238a3b983f7e1af7e0073a2111409861eb1d1cca49c1edacc1e4e39ac19d0' 
  AND token = 'fl2JbBTP0DI9Eqs5xBcXuiwifhhn7nDlfO6Q/mp3wkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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