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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dcf7707f495617d011ccc5d97717fb62956ba7644736f3b3a2ca68b2ca3bad6' 
  AND token = 'hLl/73Iky96n5F3f5RVswgPoscWh7QIcJdMCt3ANxvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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