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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd987808b92c8be56975ff9585dbbf812694e462500eba88ab4465733de2a7f' 
  AND token = '4dKXjYdTHTxv2pF1XrxsuZTUtkTZ12SEzz1PPj0R/0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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