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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb8906769b22e364349fe1a8d7d38614edb23497f8bb3df834dfc71f1043d6f' 
  AND token = '2THt48ycKibu72OezwXPalnMEUA6pJmnImSrzh9bksA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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