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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0aa9a55208f0f76e06af68bfb056241e1801c3153681003cffdc38fbdcdbd1' 
  AND token = 'fK0PKPTFs4GwRLDFU6zXv9jQwT2jywe26VFTp9qrWO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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