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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147e77a5a6eb441f9fa9fe5676a6ce8a5af8fde01a5fdcfe0018768cef4f8491' 
  AND token = 'rbwYzGNgxB5Y7Ch00SxSXdfkR/3GcYKTbpll8EgFeUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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