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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f997eaa7da1a8dcd05ce90711cef4118e1cf36e323dd086eace2b6ba62da37fc' 
  AND token = '7WB94/JSCY49orizF7OlPGTZ9t7IERqRyChP8bLORb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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