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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c24e2d61d3365f577207fe704d51cdf64d9f0a0da85292f881fb1fa6a16c707' 
  AND token = '4QXuOWDtvWl4ScMWJub/zNPN0ZuFK9TkV6a19PnZYJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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