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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cd61cc0ee2267705ae25a0187f19dfa9a5fa0347f844558856448719d62ce7c' 
  AND token = '7aRdAWeL0sVOtS3SPcICMs6qgB3bhQYQJFUQmqHysOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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