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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6361380fd16681e5d5df2b2af1056ce35eceb62c0c316b3b0562cf636d6d50df' 
  AND token = 'KJkverhxW6+zLbe1Jx1yyfi6tojpGOwdYWAdBgfDjls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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