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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28b552bfa5af93d5258dbe0ebe056e8ad0f8a93689d4a297c03a21e8f4af7fa' 
  AND token = '5tMoZLtK/S4TF4JPUJcJCNi5kGtWqqpEh6NF/JgD05k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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