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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb16effc0ba7dd328d8f7798bb757abf9d4b5388b48b82a7c31a2b4a8c48a87' 
  AND token = 'nyjEn5HOUEjxnF/FV7YgS1woNxaTD4cICKZ5fJQBoFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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