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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d9851c9fb836b5e351f431a565afc80db6817e886a6c78e77585c3add34207' 
  AND token = 'EXSTcVx3pj2DrxCb8hxDZTu76GIZfTEyyy+Ov5UvYMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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