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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81140a8b68d3a7b08edd65b26b015befe38fbdbe22bcbfeb6aa1ffba72ed7751' 
  AND token = 'zFefxdyPFUna9Gk5jb6UWFIBX0h0qAX9iHZvKqAw5L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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