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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61b2a21815c431f8c40e85ca78b6450617e8ea11750f2974f8c37ec7365f18b' 
  AND token = '459zOWajigGvY/kB9iqU8B3zEijBnPto4yOKT5JE0/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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