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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8362aa2921905ae967bce0c55ed128f7cff56f22904e81ee9872cb8a1e06a9b7' 
  AND token = 'c4mgtBikdIuwRIodu0I8EYbPm8/MdlHVZj6FZ5cf87s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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