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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af39cb1a8a9bc7d2a87b28fa3ff43da611231dd732c7089d0e7c246f63d26fb' 
  AND token = 'aAocjyjbOJ5OAWwx2fxs0frex0lprNuT32/SCR8Lp1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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