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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26be1b813d7d1255e0e1428be2e43f9cada9c9a812e3fb55b8fd3cea80af964' 
  AND token = 'm99gS2EHWMyniGXVJtwoi+L4bdssuF19fDlhEVAOdYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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