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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1922a88a0bb160445767bf3d5173c1b8fd07df657236777a4b6ee31c3f0ec3b' 
  AND token = 'x+NSjV8uu3VWlAZhwh5jQZQWsxLxgAkAEe6NAlP+nug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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