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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f99a757061bc157d87a6ddfff90baf18846679d1a6bd17ec50a0ba1d5fa7ef' 
  AND token = 'hLsuDeystScdLO/UH7/cQ0BF4kt9PfKtAWkoEowzeQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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