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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6dda24b16d0950567c55ec92cf6f3c79a924a44716eecbe4c4a6c544b02b29' 
  AND token = '0rTRv9/2YHxmBqf8Y7NyxxuaZyuzVbWJSokfNcT/u1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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