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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598a0e4b0da2a1cbaeaff6ce21a2c68c9c9c8e499479e8d7e5bd93f91c8a7247' 
  AND token = '1ONB0vRKahIj8VueoAuITVEXUZMF/f2921tmXdjCFjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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