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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ec3feea0a1f29221a2808bb95041a6a6dd8c08bf5a92f24ea8076f0a7bd6b4' 
  AND token = 'F4zyeP5xIM3iE05JFX+XjjYrN+jhetN2KqY7FKz8UG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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