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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e2960d2ed508cb079352c9c9833a72920abe4d4627f3c5995a92610189dc87' 
  AND token = 'fXvGvz8bff5usjvq5tn4U9sQXJQRMs9iBj2z1VACqGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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