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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6761ce9ed4bd15e8b3f0ee63a999e0adf5e08c5cb23bbcc3623d84a8cd586b69' 
  AND token = 'K8pe3Q7pTxgLogG9ATfQNktC98ojDafe9LtHm2de68k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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