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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32726f9ec7c07d86c77c98c989b95aefa7819b1931c103f883b2e6a15bf5c1d6' 
  AND token = '7KRB62rX0A4jezjjwsrFX7c7YRjOOX0mOrSAYkHhKtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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