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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb82b00d4ea13bc0e16472700e33e2badaac949ead78eef3b1af4969fb0f83d' 
  AND token = '1Up8i8QpnZOXmJ6+fZpBMz5tfWJk4Q3Mpcq1714dA4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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