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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76196c49c424ade616b95354e92b16f4aa4f0929ef09a6ad417ce9e0dc323f2' 
  AND token = 'ba20VwpMmMnb7P2U+Bnr7dNqFBTZo9YGE6y1hCwVdnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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