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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf70fc6ebb32f5e3e6ed4da8e1be70aa1adbc2fcddd04c19580cc14db95c7ab' 
  AND token = 'H5Is4xn/L/Y/LTNdIR68y+2FLCctglCqVz7rcyWUkRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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