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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc211ab8df61b65108377c1ffb70068295b11ace1e2a94a8dbaa56f0aa7e91d' 
  AND token = 'mQex4nU2YgZfoWs6jRaHO8hHonxZgY4Q+VlJMKKshMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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