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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b98da930e9806a47e1feb533a84bced1809d0254f790a42d407358daa93e07' 
  AND token = 'bK5Smvsf6W+gE7yNib7bvUGHJ6n7IIElfK/SM3Oy+E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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