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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8704cab93c971a475bf5c4d86407878ca6a3d5798c5ebcbe8f4ebf0bbbeeec7e' 
  AND token = 'DzPlWJ3FkDW4LbDNe9bQAAFuDvX5sjqpTyu9VnC/zGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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