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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01d626c671bf9890651c253e3d45e1322fecd79660dc4efacca3ffb7d9b7a27' 
  AND token = 'zvfN0mnEkfC7ptWG7B6YL4y/qI9DGhXCl624e7VH6n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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