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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdc5e601b524ff2aa11f7c4546739add2d8b801370ebcee702e303c315e172c' 
  AND token = 'heQURgsngYrM0BD3qOrlkLeKjhuz3VjqXQkb1Jc8QGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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