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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd93629d6f5c77112cd13b48665b8cab5adb3ebba98ec326ae7cc88915fc0ba' 
  AND token = '0PBJb2mJ7Ma1ReCykWoQzHCHvNExI9To38PEdzNqapM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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