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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36efffc0d3da4c55ee2b8c7d76a284ee32a26129df19e1815e5ca0d6bbb3f6ae' 
  AND token = 'AfXG8weXC7d7QcBZ1ZNZ9zq6iVVDKtVLlavHk6lLiQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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